土壤环境对埋地金属管道所受高压直流干扰的影响

Effect of Soil Environment on HVDC Interference to Buried Metal Pipeline

利用数值模拟技术研究了高压直流(HVDC)输电系统接地极对长输管道干扰受土壤环境的影响规律,并通过现场监测数据对模拟结果进行了验证。结果表明:当表层土壤厚度超过9km时,深层土壤电阻率的影响可以忽略;干扰程度受直流接地极附近土壤以及距离直流接地极最近处管道附近土壤影响很大;如果直流接地极不可避免在埋地管道附近时,应尽可能选择埋设在土壤电阻率较低的区域;模拟计算所得管道沿线电位分布情况与现场监测数据基本一致,因此该数值模拟方法可以准确预测土壤环境对埋地金属管线受高压直流接地极干扰的影响。

A numerical simulation technology was used to study the effect of soil environment on the interference from ground electrodes in high voltage direct current(HVDC)transmission system to long-distance transmission pipelines,and the simulation results were verified by field monitoring data.The results show that when the thickness of the surface soil was more than 9km,the effect of deep soil resistivity could be neglected.The degree of interference was greatly affected by the soil near the DC ground electrodes and the soil near the pipe closest to the DC ground electrodes.If the DC ground electrodes were unavoidable near the buried pipeline,they should be buried in the area with low soil resistivity as much as possible.The potential distribution along the pipeline calculated by the simulation was basically consistent with the on-site monitoring data,so this numerical simulation method can accurately predict the effect of soil environment on the interference from HVDC ground electrodes to buried metal pipeline.